B.Hallgren, CERN EP/ ATI PRR CERN 4 March 20011

ATLASATLAS DCS

Design description

of

thethe E Embedded mbedded LLocal ocal MMonitor onitor BBoardoard

ELMBELMB

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 20012

ATLASATLAS DCS

Introduction to the ELMBIntroduction to the ELMB

Application -specific motherboard with signal-conditioning electronics, optoisolation ADC, DAC, connectors

CANopen

CA

N

Temperature

Magnetic Field sensors

Voltages, Currents

Thresholds

ON/OFF monitor

ON/OFF

I2C

JTAG

USER Defined

ANALOG IN

ANALOG OUTDIGITAL IN

DIGITAL OUT

Front-end Electronics

Configuration

ELMB

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 20013

ATLASATLAS DCS

ELMB block diagramELMB block diagram

CANTrans-ceiver

OPTO

OPTO

VoltageRegulator

ATMega103L

128K flash4K RAM4k EEPROM

64 chMUX

ADCCS5523

(other) Port A Port C Port F

VoltageRegulatorVoltage

Regulators

VCP, VCG 8 to12V, 20 mA

CAN GNDCAN GND

VAP, VAG

8 to 12V, 10 mA

VDP, VDG

6 V to 12V, 15 mA

DIGITAL GNDDIGITAL GNDANALOG GNDANALOG GND

CAN bus cable

4

±5V 3.3V

5V

Digital I/O

8 8 810

AT90S2313SLAVE

SAE81C91CAN

controller

DIP switches

OP

TO

OP

TO

5

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 20014

ATLASATLAS DCS

ELMB front side

50 mm

67 mm

DIP-SWIDBAUD

ISP

OPTOs

CAN SAE81C91

Voltage regulators

ATMELmicros

CAN Tranceiver

3.3 to 5.4V option?

VSup

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 20015

ATLASATLAS DCS ELMB back side ADC ELMB back side ADC

2*50 pin Bergstac connector

ADC AnalogMUX

REF

Logic

Latch

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 20016

ATLASATLAS DCS

ELMB specificationsELMB specifications

General-purpose plug-on module (50 x 67 mm2))

CANbus interface (Full-CAN controller)CANbus interface (Full-CAN controller)

CANopen communication protocolCANopen communication protocol

In System Programmable also via CAN busIn System Programmable also via CAN bus second microcontroller with dedicated tasks for SEE

Optional 64 inputs of 16-bit ADC with 7 bit gainOptional 64 inputs of 16-bit ADC with 7 bit gain Cost goal $2 / ch for ADC+CAN Cost goal $2 / ch for ADC+CAN

Presently component cost (with pcb) ~ 94 CHF (>5k)

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 20017

ATLASATLAS DCS Key componentsKey components

• ADC

• Optocouplers

• Power regulatorsPower regulators

• MicrocontrollersMicrocontrollers

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 20018

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ELMB ADCELMB ADC

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 20019

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Crystal CS5523

Resolution 16 + 7 BitsCMR DC, 50Hz 120 dBLinearity ± 0.0015% FSOffset ± 2 LSBStability 20 nV / ºCGain 1 ppm/ ºC

Delta-Sigma ADC2 Hz to 100 Hz

±25 mV to ±5 V differential

BUT Absolute precision ± 15%!

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200110

ATLASATLAS DCS

Stability of the ADC Stability of the ADC ELMB 25 mV (Testbox)

21.117

21.118

21.119

21.120

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Time (s)

AD

C r

ead

ing

s (m

V)

1 V1uV

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Resolution ADCResolution ADC

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200112

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High precisionHigh precision temperature measurement temperature measurement

After calibration ~3 mK absolute precision at ATLAS LAr calorimeter given by sensor quality

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200113

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OptocouplersOptocouplers

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200114

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Optocoupler tests Optocoupler tests Test of components in TCC2 1998 and 1999

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200115

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Optos..Optos..

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200116

ATLASATLAS DCS

Optocouplers for ground loop isolation

ELMB uses two types:

slowslow HCPL0731 (considered to be safe for SEE)

fastfast HCPL-0601 (is sensitive for SEE)

in the ELMB this SEE sensitivity is handled by the CAN bit error handling!

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200117

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Power regulatorsPower regulators

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200118

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Voltage regulators for protection and filtering

V IN O U T

G N D

ELM B

220 Ω

3.3 V MIC5203

is loaded with 11 ohms or 1Watt

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200119

ATLASATLAS DCS

Current ~150 mA

After 200 ms the DC current is 35 mA

3.3V

DC load dissipation is 13 mW

DC Regulator dissipation is 350 mW

Limiting

Output voltage of the MIC5203

Trigger

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200120

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Accelerated ageing testAccelerated ageing test~~40000h at 2540000h at 25ooCC

ELMB Endurance test

0

10

20

30

40

50

7.3.01 9.3.01 11.3.01 13.3.01 15.3.01 17.3.01 19.3.01 21.3.01

Date

Cur

rent

(mA

)

10

20

30

40

50

60

70

80

90

100

110

Tem

per

atu

re (

C)

ELMB3_digital ELMB4_digital Temperature

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3.3V Regulator NIEL results3.3V Regulator NIEL results

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200122

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MicrocontrollersMicrocontrollers

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200123

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ELMB Microcontroller chosen to have low power consumption

CSEM R&D

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200124

ATLASATLAS DCS ATMEL AVRATMEL AVR

Based on Nordic VLSI RISC coreBased on Nordic VLSI RISC core Flash memory Flash memory In system programmable ISPIn system programmable ISP Low powerLow power Low cost = $1 to $9 Good softwareLow cost = $1 to $9 Good software HW and SW compatible family from 1k to 128 kHW and SW compatible family from 1k to 128 k ATmega103L or ATmega128L?ATmega103L or ATmega128L?

B.Hallgren, CERN EP/ ATI PRR CERN 4 March 200125

ATLASATLAS DCS AVR..AVR..

The behaviour of the ELMB is (of course) entirely under software control

e.g. the SEE sensitivity is determined by the SOFTWARE